Means for locking electric-light-globe attachments to holders



Aug. 25 1924. 1,566,487

E.. W. HUTCHXNGS MEANS POR LOCKING ELECTRIC LIGHT GLOBE ATTACHMENTS To HOLDERS Filed Sept. 14 1922 www Patented Aug. 26, 1924.

UNITED STATES ERIC WILLIAM HUTCHINGS, OF MIRAMAR, WELLINGTON, NEW ZEALAND.

MEANS FOR LOCKING ELCTRICeLIGHT-GLOBE ATTACHMENTS TO HOLDERS.

Application led September 14, 1922. Serial No. 588,263.

.To all whom t 'may' concern:

Be it known that ERIC VTLLIAM HUTCH- iNGs, of Tahi Street, Miramar, Wellington, in the Dominion of New Zealand, citizen of the British Empire, has invented certain new and useful Improvements in Means for Locking Electric-Light-Globe Attachments to Holders, of which the following is a specification.

This invention relates to means for locking electric light globes'and thelike to lamp holders, bases or sockets and has for its object to provide means for prevent-ing the removal of the globes from their holders unless the glass of the globe is broken.

This object is effected by the provision of means which prevent the globe from being turned and moved upwardly in the holder after being secured therein by the usual bayonet joint such as means co-operating with the usual locking pins which are on the metal cap of the globe, whereby the globe is prevented from being turned so as to permit of it being removed from the holder.

While the invention is applicable in all locations to the usual bayonet joint type of globe and holder it is particularly applicable to such holders when located in public places and where thieves have opportunities of using tools on the joint for some length of time without being observed. It is in these cases that the usual kno-wn type of locking means has little' eectiveness.

rEhe invention consists in the foregoing features and in the features and arrangements and combinations of parts hereinafter described and more particularly pointed out in the claims.

The preferred embodiment of the invention is illustrated in the accompanying drawings wherein Figure 1 is an elevation of the locking device in locking position securing an electric light globe to its holder,

' Figure 2 is a sectional plan through B-B in Figure 3 and Figure 3 is a part sectional elevation of the locking device shown in Figure 1. There is provided a collar 6 which is made of thin brass or other suitable material and which is provided with au internally threaded head 8 adapted to be screwed on to the externally threaded portion 5 of the lamp holder 3 which threaded portion 5 is usually also adapted to carry a shade carrier. The collar 6 is preferably of sufficient diameter to embrace not quite closely the locking pins 4 on the holder 3 and is of such length as to have its lower lend 7 screwed down on to the globe 1.

It will be seen that the whole of the bayonet joint is effectively protected bythe collar 6 and there is no possibility of introducing a tool either at the bottom or the top of the collar G to interfere with the joint. v f

The collar 6-is provided preferablyl with means such as a spring tongue 9 secured at one end to the inner surface 1.0 of the collar 6. The other free end 11 of the tongue 9 normally projects within the collar 6. The tongue 9 is so positioned that when the collar 6 is being screwed down on to the globe l the tongue 9 yields and slides over the locking pins which are on the cap (2) of the globe 1 and the projecting end 11 of the tongue 9 co-operatcs with one of the locking pins 4 to prevent the collar 6 from being screwed upwards again. It will be seen that when the collar 6 has been screwed down on to the globe 1 into locking position, there is no possibility of it being removed and this makes the globe irremovable from its holder.

To remove the collar 6 it is necessary to break the globe 1 at its upper end so that the collar 6 may be screwed down 0E the lamp holder 3.

In the preferred mode of operation the threaded head 8 of the collar 6 is first of all screwed on to the threaded portion 5 of the holder 3 sufficiently far up to enable the locking pins 4 on the cap 2 of the globe 1 to be inserted into the usual slot (3a) of the holder 3.

The collar 6 is then screwed down until its bottom edge 7 rests closely against the globe 1 the tongue yielding and sliding over the locking pins 4. As soon as the collar is in position with its lower end 7 close against the globe 1 it is impossible to screw it upwards as one of the locking pios 4 bears against the end 11 of the tongue 9. The only possible way to remove the collar 6 is by breaking the globe.

1. In combination, a socket member provided with a fastening element, an electric light bulb having a cap member provided with a fastening element adapted to engage the fastening element of the socket member for connecting said members together, one

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